Of the 14 populations have been reported (Edwards, Parchman, and Weekley, 2011: 2), 9 of these populations are each composed of its own genotype, while the remaining four populations contribute 22-32 additional genotypes (Edwards, Parchman, and Weekley, 2011: 2). The endangered status of Ziziphus celata is caused, in part, by self-incompatibility and few mating types in a population (Edwards, Parchman, and Weekley, 2011: 1-2). Self-incompatibility is the inability to pollinate using asexual reproduction (Edwards, Parchman, and Weekley, 2011: 2). Gitzendanner, Weekley, Germain-Aubrey, Soltis & Soltis (2012: 223, 231) reported 30 clonal linages from 1,000 plants, indicating high numbers of clones and low genetic diversity.